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Preventive Maintenace on Tube radios?
#2

Hi Stoney

Definitely play the radio once in a while. The Electrolytic caps must see DC to be kept in good shape. Certainly, dust the set and the tubes. If this is an AC-DC "AA5 or AA6" radio and you have a Variac, use that to power the radio, bringing the current up slowly, to prevent the "surge" that often occurs in the tube filaments. This can happen in a transformer powered set, but this is not common. Judiciously (and I DO mean judiciously) use compressed air to dust the chassis and capacitor. Pay close attention to not aim the compressed air at the speaker. Alternately, keep the radio in a closed display case.

Care for the case in a normal manner. Dust and clean with the appropriate cleaner and polish for the case type, wood vs Bakelite vs Plaskon vs Catalin.

Any use of oil for shafts should be the absolute minimum. the bearings of a tuning capacitor are generally lubricated with a light grease and should not require maintenance except once every several years.

Hope this helps, other experts please jump in, especially if you think that this is not good advice.

"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis

Best Regards, 

MrFixr55


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RE: Preventive Maintenace on Tube radios? - by MrFixr55 - 08-09-2025, 09:20 AM



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